The Spectrum Analyzer demo has a mode menu via which the application can be set to be in one of three modes: "play tone", "record and play back" or "play file". Items in this menu are checkable; at most one of these items should be checked at any time, indicating the current mode of the application.

Using the following steps, multiple items become checked at once:
1. Launch application
2. Select "record and play back". This item is now checked.
3. Select "play generated tone" and then cancel the dialog. The "record and play back" and "play generated tone" items are checked.
4. Select "play file" and then cancel the dialog. All three items are checked.